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  • 1
    ISSN: 1612-1112
    Keywords: Silica surface ; Electrophoretic mobility ; Metal impurities ; Zero point of charge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Electrophoretic mobility measurements in the pH 2‐10 range are described for several commercial HPLC silica microparticles and a laboratory-produced product. The content of metal impurities for the silicas was also determined by AAS. An acidic/hydrothermal treatment was used to generate a more homogenous surface for some of the silicas. The zero points of charge (zpc) for both a native and a treated silica plus several commercial HPLC silicas were compared. The electrophoretic mobility method may be useful in predicting the utility of certain types of silica supports for chromatographic separations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 4193-4198 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Phenylcyclobutendion 1 bildet mit Aromaten in Gegenwart molarer Mengen Aluminiumchlorid Diarylcyclobutenolone 2, die zu Diarylcyclobutendionen 4 oxydiert werden können. Diese Dione erhält man auch aus Bromphenylcyclobutendion 3 mit denselben Aromaten und Aluminiumchlorid als Katalysator. Benzole mit Substituenten erster Ordnung werden in p-Stellung elektrophil angegriffen.
    Additional Material: 3 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 2225-2233 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Cyclobutenediones, XV. Reactivity of 3-Hydroxy-1,2-diphenylcyclobut-2-ene-4-onesHydroxydiphenylcyclobutenones 1 can be methylated by diazomethane to give methoxydiphenylcyclobutenones 2. On addition of diluted sodium hydroxide solution sodium salts 3 are received which react with benzoyl chloride, acetyl chloride and bromophenylcyclobutenedione to form the esters 4 and 6.2 and 4 can be oxidized to diphenylcyclobutenedione 5. 0-Phenylenediamine or N-methyl-0-phenylenediamine react with 1 to form trans,-stilbenes 7 and dihydro-quinoxalino-quinoxaline 8 or dimethyl-dihydro-quinoxalino-quinoxaline 10, respectively.
    Notes: Hydroxydiphenylcyclobutenone 1 werden mit Diazomethan zu Methoxydiphenylcyclobutenonen 2 methyliert. Mit verdünnter Natronlauge erhält man aus 1 die entsprechenden Natriumsalze 3, die mit Benzoylchlorid, Acetylchlorid und Brom-phenylcyclobutendion zu den Estern 4 und 6 reagieren. 2 und 4 werden zu Diphenylcyclobutendion 5 oxydiert. O-Phenylendiamin bzw. N-Methyl-o-phenylendiamin bilden mit 1 trans-Stilbene 7 und Fluoflavin 8 bzw. Dimethyl-flouoflavin 10.
    Additional Material: 4 Tab.
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